Good for planes and helis. It has low run time of about 10 flights, and runs well. For some reason it has trouble starting the rotor. I have to spin the rotor by hand then slowly bring up the throttle or it stalls. After that it has good power. I might have had it too rich causing the lack in power. It works great in planes, it took a p-51 over 100mph with a 10x10 prop. What you see is what you get. The drive washer is also included. The muffler has stripped mount holes, so I will include lock nuts.